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미생물 포괄 고정화방식을 이용한 수산물 가공공장 폐수처리
정병철,장수현,김종배,김건배,최선남,이근우,정병곤 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-
Feasibility of simultaneous removal of organic and nitrogen is evaluated as applying microbial entrapping method to treat fish processing wastewater. Treatability test is conducted immobilizing activated sludge from municipal sewage treatment plant to gel matrix made of cellulose triacetate. Stable operation can be possible when applying organic and nitrogen loading rate increasingly to wastewater treatment system composed of anoxic and oxic tank. Organic loading rate and nitrogen loading rate are applied 0.65-1.72kg COD/㎥/d and 0.119-0.317kg T-N/㎥/d, respectively. In case of wastewater from fish processing plant used in this study, it is evaluated that 0.3kg T- N/㎥/d is upper limit of applicable space loading rate because effluent T-N concentration is exceed 60mg/L, legal effluent dishargeable limit of T-N concentration in Korea, when space loading rate is exceed 0.3kg T-N/㎥/d. It is evaluated that nitrification of system is performed efficiently regardless fo variation of applied loading rate because removal efficiency of NH_(4)^(+)-N is relatively constant when the applied NH_(4)^(+)-N loading rate is increased gradually, while decrease of T-N removal efficiency is apparent when the applied loading rate is increased gradually. Nitrate removal efficiency in this study is varied from 98.62% to 99.51% depending on applied loading rate, while nitrification efficiency of oxic reactor is varied from 94.0% to 96.9%. It is showed that COD removal efficiency is varied from 94.2% to 96.6% and T-N removal efficiency is varied from 73.4% to 83.4% depending on loading rate applied in this study.
김건희,김효식,양순철,이상용,국명호,이선규,김윤중,홍권희 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
This paper describes development of low cost precision machine that has combined the Build-in Motor with a vacuum chuck. This study mainly aims to find out a cutting condition for maintaining optimum surface condition and to examine cutting characteristics of the precision machine that is equipped by diamond bites. The cutting materials is Al alloy. Several experiments were carried out to find out the main factors that affect the surface roughness such as principal axis RPM(rotation per minute), feeding speed, and cutting depth. As a result, we obtain The optimum cutting condition of the developed precision machine.
Effect of TiO<sub>2</sub> particle size and layer thickness on mesoscopic perovskite solar cells
Lee, Dong Geon,Kim, Min-cheol,Kim, Byeong Jo,Kim, Dong Hoe,Lee, Sang Myeong,Choi, Mansoo,Lee, Sangwook,Jung, Hyun Suk Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.477 No.-
<P><B>Abstract</B></P> <P>Mesoporous TiO<SUB>2</SUB> (mp-TiO<SUB>2</SUB>) layers are commonly used as electron transport layers in perovskite solar cells, which help to extract electrons from the perovskite light-absorbing layer and transport them to the electrodes. We investigated the effects of the layer thickness of mp-TiO<SUB>2</SUB> and particle size of TiO<SUB>2</SUB> on photovoltaic properties, in terms of the surface area of the mp-layer and the interfacial areas of the TiO<SUB>2</SUB> nanoparticles in the mp-layer. Various mp-TiO<SUB>2</SUB> layers with thicknesses of 150, 250, and 400 nm and particle sizes of 25 nm and 41 nm were prepared to compare the photovoltaic properties of such layer-containing perovskite solar cells. Time-resolved photoluminescence decay and impedance studies showed that interfacial resistance as well as perovskite-to-TiO<SUB>2</SUB> charge injection are important factors affecting photovoltaic performance. The deterioration of the photovoltaic parameters with increasing TiO<SUB>2</SUB>/TiO<SUB>2</SUB> interfacial area also confirms that the interfacial series resistance that arises from these connections should be reduced to enhance the performance of mesoscopic perovskite solar cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electron injection and transport properties of mesoporous layer containing TiO<SUB>2</SUB> nanoparticles are investigated. </LI> <LI> The photovoltaic properties are poor with small TiO<SUB>2</SUB> particles and thick mesoporous layers. </LI> <LI> This poor performance is due to the increase of the area of the TiO<SUB>2</SUB>/TiO<SUB>2</SUB> interface. </LI> <LI> The TiO<SUB>2</SUB>/TiO<SUB>2</SUB> interfacial resistance largely influences the photovoltaic parameters. </LI> </UL> </P>
Lee, Yong-Jin,Lee, Tong-Geon,Jeon, Woong-Bae,Kim, Dae-Yeon,Hong, Min-Jeong,Lee, Man-Bo,Hyun, Jong-Nae,Kim, Mi-Jung,Lee, Mi-Ja,Park, Cheol-Su,Seo, Yong-Weon 한국작물학회 2010 Journal of crop science and biotechnology Vol.13 No.2
Cereal seed storage proteins are encoded by complex multigene families and their subunit profiles are highly related to end-use qualities. Each fraction of albumin and hordein was extracted and its subunit profile was evaluated in related to malt and grain quality parameters. The purpose of this study was to provide selection criteria for high quality malting barley using grain and malt quality parameters and biochemical-genetic information. Grain and malt quality of 13 local adaptability test (LAT) lines were evaluated for malting process. A total of 16 germplasm accessions of high or low seed storage protein content were also evaluated for biochemical-genetic analysis. The correlation coefficients among quality parameters were analyzed. Several important quality parameters in brewing process showed significant positive or negative correlations. Seed storage protein subunits of albumin and hordein of all tested lines and accessions were evaluated using 12% 1D SDS-PAGE. Scored data of protein subunit's presence or absence was applied to Agglomerative Hierarchical Clustering (AHC) for statistical analysis and showed specific grouping patterns among tested lines. Clustered lines with subunit information were highly related with agricultural performance and grain and malt qualities. Based on the profiles of seed storage protein subunits, association of hordein subunit of 38, 43, and 65 kDa with high malt scored lines was found. The obtained results would provide improved selection criteria for high quality malting barley in the malting barley breeding program.
이건식(Geon-Sik Lee),모동영(Dong-Yeong Mo),이상철(Sang-Cheol Lee),최창영(Chang-Young Choi),조춘호(Chun-Ho Cho),김태웅(Tae-Woong Kim),박귀근(Gwi-Geun Park) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
매트릭스컨버터의 제어기법은 입력측의 전류형과 출력측의 전압형의 조합에 의해 구성된 미래지향형 AC/AC 전력변환시스템이다. 이를 제어하기위해서 기존 SVPWM을 적용하면 섹터정보 및 인가시간의 계산과정이 복잡해지고 계산량이 많아지는 단점이 있다. 본 논문에서는 상기의 문제점을 해결하기 위해 전압형 인버터에 사용하고 있는 기존 간략형 SVPWM과 함께 입력측 전류형에도 이를 변형하여 적합한 간략형 SVPWM를 동시에 적용하여 전체의 PWM에 관련된 계산과정을 단순화시키고 계산량을 저감시킬 수 있는 제어기법을 제안한다.
지지면에 따른 발목관절의 족저굴곡 운동이 비복근 두께에 미치는 영향
이건철 ( Geon Cheol Lee ),김봄 ( Bom Kim ),김지수 ( Ji Su Kim ),남인성 ( In Seong Nam ),박유진 ( Yoo Jin Park ),신우진 ( Woo Jin Shin ),우수민 ( Su Min Woo ),차성기 ( Seong Ki Cha ) 대한통합의학회 2014 대한통합의학회지 Vol.2 No.1
Purpose : The purpose of this study was to perform the calf-raise exercise on the stable support surface and unstable support surface for comparing deference of the gastrocnemius thickness changes that measured by ultrasonography. Method : Subjects stand on unstable support surface and a stable support surface with both feet. Keeping calf-raise position in the 3 seconds, and then had to return back to the starting position. Total of 3 sets of 15 repetitions performed and give a 30-second rest between each set. In this way, exercise performed 3 times a week, performed a total of 6 weeks. Result : 1. gastrocnemius muscle thickness before and after exercise in experimental group A was significantly different(p<.05). 2. gastrocnemius muscle thickness before and after exercise in experimental group B was significantly different(p<.05). 3. gastrocnemius muscle thickness in experimental group A and experimental group B was significantly difference(p<.05). Conclusion : In conclusion, calf-raise exercise on unstable support surface was more efficient than stable support surface for increasing thickness of gastrocnemius.